Evolution of Al Alloy Melt Foam Pore Structure in Foaming Process

2007 ◽  
Vol 544-545 ◽  
pp. 315-318 ◽  
Author(s):  
Dong Hui Yang ◽  
Chang Hwan Seo ◽  
Da Peng Yao ◽  
Bo Young Hur
Keyword(s):  
Titanium Hydride ◽  
Pore Diameter ◽  
Al Alloy ◽  
Foaming Process ◽  
Small Pore ◽  
Specific Temperature ◽  
The Relationship ◽  
Al Alloy Foam ◽  
Decomposition Properties ◽  
Foaming Time

A study was carried out to understand the relationship between the pore structure’s evolution of Al alloy melt foam and its preparation variables, which include decomposition properties of titanium hydride, the stirring foaming time and the holding foaming time. The results show that the foaming process of Al alloy melt can be inferred by the relation curves of decomposition quantity of titanium hydride and time at a specific temperature. The porosity of Al alloy melt during stirring foaming period is kept constant while the pore number increases and pore diameter decreases, which is a new method of fabricating Al alloy foam with a relatively low porosity and small pore size.

STUDY ON FABRICATION OF SHAPED AL ALLOY FOAM BY TWO-STEP FOAMING METHOD

2009 ◽  
Vol 23 (06n07) ◽  
pp. 972-977 ◽  
Author(s):  
XUMING CHU ◽  
HUI WANG ◽  
SIYUAN HE ◽  
DEPING HE
Keyword(s):  
Al Alloy ◽  
Foaming Process ◽  
Irregular Shapes ◽  
Cell Structures ◽  
Al Foam ◽  
Novel Method ◽  
The Relationship ◽  
Al Alloy Foam

In this study, a novel method two-step foaming method (TSFM) has been proposed to fabricate Al alloy foams with irregular shapes. The two steps Al alloy foaming process and cell-structures evolution have been investigated experimentally. The relationship between foamable precursor, foaming parameters and cell-structures of the final foam samples has been observed. Moreover, the Al foam samples with regular and irregular shapes prepared by TSFM are shown in this paper.

A Study on Kinetics Parameters of Titanium Hydride Powder from Its TPD Spectrum for Metal Foam

2007 ◽  
Vol 534-536 ◽  
pp. 937-940 ◽  
Author(s):  
Dong Hui Yang ◽  
Sang Youl Kim ◽  
Bo Young Hur
Keyword(s):  
Titanium Hydride ◽  
Metal Foam ◽  
Al Alloy ◽  
Superposition Method ◽  
Kinetics Parameters ◽  
Foaming Process ◽  
Titanium Hydride Powder ◽  
Temperature Programmed ◽  
Set Up ◽  
Temperature Programmed Decomposition

In this paper, the whole temperature programmed decomposition (TPD) spectrum of titanium hydride was acquired by the special designed set-up. After separating and simulating the TPD spectrum by using Spectrum Superposition Method (SSM), Consulting Table Method (CTM) and differential spectrum technique, the kinetics parameters of titanium hydride and corresponding equations were obtained. Using these kinetics equations, the fabrication parameters of Al alloy foam can be determined and foaming process of Al alloy melt can be predicted.

Effect of Decomposition Kinetics of Titanium Hydride on the Al Alloy Melt Foaming Process

2015 ◽  
Vol 31 (4) ◽  
pp. 361-368 ◽  
Author(s):  
Donghui Yang ◽  
Jianqing Chen ◽  
Hui Wang ◽  
Jinghua Jiang ◽  
Aibin Ma ◽  
...  
Keyword(s):  
Titanium Hydride ◽  
Decomposition Kinetics ◽  
Al Alloy ◽  
Foaming Process ◽  
Kinetics Of

scholarly journals Permeability of Concrete and Correlation with Microstructure Parameters Determined by 1H NMR

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yurong Zhang ◽  
Shengxuan Xu ◽  
Zhaofeng Fang ◽  
Junzhi Zhang ◽  
Chaojun Mao
Keyword(s):  
Water Permeability ◽  
Permeability Coefficient ◽  
Pore Diameter ◽  
Gas Permeability ◽  
Steady State Flow ◽  
Test Device ◽  
Water Permeability Coefficient ◽  
Microstructure Parameters ◽  
The Relationship ◽  
Better Than

Water and gas permeability coefficients of concrete with different water-binder (w/b) ratios and admixtures were measured by a self-designed test device based on the steady-state flow method for liquid and the method of differential pressure in stability for gas, respectively. In addition, the micropore structure of concrete was determined by 1H nuclear magnetic resonance (NMR). Results indicated that there are good correlations between water and gas permeability of concrete with different w/b ratios, with correlation coefficient greater than 0.90. Better correlations between water permeability and segmental contributive porosity ranged from 10 to 100 nm and 100 to 1000 nm can be identified, but the gas permeability is more relevant to the segmental contributive porosity ranging from 100 to 1000 nm. Moreover, the correlation between water permeability and contributive porosity for each pore diameter is always better than that of gas permeability. The influence of admixtures on the relationship between permeability and pore size distribution of concrete is significant. Moreover, water permeability coefficient is one or two orders of magnitude lower than the gas permeability coefficient.

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